atdt

<?php

// $ /usr/bin/hhvm -vEval.Jit=1 --count 10 outer.php
// mapValues: 148.63	mapValuesUse: 76.83
// mapValues: 74.01	mapValuesUse: 55.72
// mapValues: 67.03	mapValuesUse: 55.68
// mapValues: 67.34	mapValuesUse: 55.75
// mapValues: 67.08	mapValuesUse: 55.75
// mapValues: 67.15	mapValuesUse: 55.80
// mapValues: 67.14	mapValuesUse: 55.83

atdt

arg_parser = argparse.ArgumentParser()
arg_parser.add_argument(
    '--slice',
    default='-2:',
    type=slicer,
)
args = arg_parser.parse_args()


def slicer(spec):

atdt

def time_ago(s):
    units = ((86400, 'day'), (3600, 'hour'), (60, 'minute'), (1, 'second'))
    ago = next('%s %s' % (s // len, unit) for len, unit in units if s > len)
    return '%s ago' % (ago if ago.startswith('1 ') else ago + 's')

atdt

Looking at performance data for load.php requests, I notice that we spend quite a lot of time in SitesModuleWorker::getSitesHash(). So I would like to know what that method does.

I grep for it, and find that it calls SitesModuleWorker::getSites(). SitesModuleWorker::getSites(), in turn, calls SiteStore::getSites().

But SiteStore is an interface, and I don't know which concrete implementation SitesModuleWorker is using, because the implementation is specified via a parameter to SitesModuleWorker::__construct(). So I need to look and see where SitesModuleWorker is instantiated.

That takes me to lib/includes/modules/SitesModule.php:29, where I see that it is SiteSQLStore::newInstance(). OK.

But where is SiteSQLStore? Oh, I see that it's in Core. OK, let's pull it up and see what its SiteSQLStore::getSites() method does.

atdt

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

atdt

<?php
/*
	Quick perf test for DeferredUpdates

	Results from running this on mw1017:

	$ /usr/bin/hhvm -vEval.Jit=1 --count 10 x.php
	Executed 1000 DeferredUpdates in 81.25ms
	Executed 1000 DeferredUpdates in 1.88ms
	Executed 1000 DeferredUpdates in 1.96ms

atdt

from __future__ import division
import collections
import re
import os
import os.path
import glob
import argparse

ignore_prefixes = (
    '/srv',

atdt

<?php
// Benchmarking script for https://gerrit.wikimedia.org/r/#/c/236401/
// Run with: /usr/bin/hhvm -vEval.Jit=1 --count 40 bench.php
// '--keys=NNN' specifies number of keys to read. Defaults to 200.

require_once __DIR__ . "/src/Util.php";
require_once __DIR__ . "/src/Exception.php";
require_once __DIR__ . "/src/Reader.php";
require_once __DIR__ . "/src/Reader/PHP.php";

atdt

#!/usr/bin/env bash
while IFS= read -r gitreview; do
  if grep -q wikimedia "$gitreview" ; then
      cd "$(dirname "$gitreview")"
      mr register
  fi
done < <(find ~/git -name .gitreview)

atdt

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
  lcz -- estimate line-count of gzip file
  Intended for log files with regular line lengths and content.

  Usage: lcz FILE

"""
import gzip